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351 Posts
Discussion Starter #3
On an engine I purchased. Looked to have been running rich, carbon / soot all over. EGR tubes blocked... Cleaned it up, swapped this out, deleted EGR and it runs okay. Just have not seen this done or heard of any potential reason for it to be done.
 

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1990 420 SEC
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189 Posts
On my car there was something similar. To get rid of that I had to replace ignition control module. If some part of idle control system is not working one way to get a semi decent idle is to plug the idle air passage partially like that.
 
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